Troubleshooting | 76
No. Display
Message
LED System Detected
Cause Corrective Action(s)
W20
Cont.
4 Newly installed cylinder
not reaching demand
for extended time due
to Low water
conductivity
4a Add 1/2 teaspoon of
salt to fill cup.
4b Adjust drain factor to
0.7 in User Defined
Settings (see operation
chapter)
W23
Control sensor
broken
Limit Sensor
Broken
No signal from
RH control
sensor
No signal from
RH Limit sensor
1 Sensor not powered 1 Use multimeter to check
that sensor is powered.
2 Sensor not wired
correctly
2 Check wiring is secure
and wired correctly per
instructions in
installation chapter.
E23 Red
3 Defective sensor 3 Check if sensor is
outputting corresponding
to RH. If not replace the
sensor.
W24
4 RH less than 5% 4 RH less than 5% are
interpreted as a broken
sensor. Contact NORTEC
Representative for
recommendation.
E24 Red
5 Humidifier control
configuration incorrect
5 Check that the humidifier
control configuration
matches the installed
sensor output.
W25
3-day idle drain
activated
3 days with no
demand for
humidity
1 Normal operation,
cylinder is drained if
there is no demand for
3 days
1 None required. If feature
is not desired change
configuration in “User
Defined Settings” level of
software.
W26
3 day forced
drain activated
3 days since last
forced drain
1 Normal operation if
configured, humidifier
is drained every three
days
1 None required, humidifier
has been configured to
drain every 3 days to
control scale build up.
W27
Safety loop
instability
Safety loop
opening/closing
rapidly
1 High limit humidistat
too close to steam
distributor
1 Locate the high limit
humidistat a minimum of
10 feet (3 m) from the
distributor.
2 Loose wiring 2 Check wiring and insure
there are no loose
connections.
3 High limit humidistat
setpoint too low
3 Adjust the high limit
setpoint to 85% or more.
4 Defective high limit
humidistat
4 Replace defective
device.
5 Air proving cycling or
chattering
5 Check for smooth
operation of air proving
switch.
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